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  • Duct

    A conduit for moving air, made from a variety of materials and in a variety of shapes.
  • Dust Mites

    These tiny creatures can cause allergies and other respiratory problems.
  • Dynamic Wall

    An insulated part of a house’s structure through which outdoor air can pass from the outdoors to the indoors and is tempered in the process.
  • Electret

    A plastic material that carries a permanent static charge, used in some air filters.
  • Electrostatic Air Filter

    An air filter composed of plastic materials that capture particulate pollutants using static electricity. See also electret.
  • Electrostatic Precipitator

    An air filter that generates a high voltage which causes particulates to become electrically charged and cling to metal plates having an opposite charge.
  • Energy-Recovery Ventilator (ERV)

    A balanced ventilation device that transfers both heat and humidity between the exhaust and supply air streams.
  • Engineered Wood

    Engineered wood has become a popular choice for environmentally preferable flooring.
  • Enthalpy

    The total amount of heat contained in air, the sum of the sensible heat and the latent heat.
  • Environmental Agents

    What the scientists mean when using this term.
  • Environmental Illness (EI)

    A medical condition involving hypersensitivities to a wide variety of common air and food contaminants at very low levels.
  • ERV

    Energy recovery ventilators (ERVs) are heat recovery ventilators (HRVs) that exchange moisture between the two air streams.
  • Exchange Rate

    The rate at which indoor air is replaced with outdoor air.
  • Exfiltration

    Air leaving a house through random holes in the structure.
  • Exhaust Air

    The air leaving a house through a ventilation system. See also supply air.
  • Exhaust Grille

    A grille through which stale air leaves a room. See also supply grille.
  • Exhaust Ventilation

    A general-ventilation strategy that uses an exhaust fan to remove air from a house. An equal volume of make-up air enters either by way of through-the-wall vents, through a fresh-air duct connected to a forced-air heating/cooling system, or through random holes in the structure of the house.
  • Exhaust-Only Ventilation

    Ventilation strategy that uses one or more fans to exhaust stale air that is replaced by outdoor air entering through passive inlets and/or random leaks. See central-exhaust ventilation.
  • Extended-Surface Filter

    An air filter configured to have a large amount of surface area to minimize resistance to airflow. See also medium-efficiency filter.
  • Filtration

    The process of removing particles or pollutants from air or water.

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